Seasonal variations of 222Rn and SGD fluxes to Ubatuba embayments, São Paulo
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Journal of Radioanalytical and Nuclear Chemistry
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We describe here an application of excess 222Rn to estimate submarine groundwater discharge in a series of small embayments of Ubatuba, São Paulo State, Brazil. Excess 222Rn inventories obtained in 11 vertical profiles varied from (3.3±1.1)·103 to (19±5)·103 dpm·m-2. The estimated total fluxes required to support the inventories varied from (0.6±0.2)·103 to (3.4±0.9)·103 dpm·m-2·d-1. Considering these results, the submarine groundwater discharge advective rates necessary to balance the sub-pycnocline fluxes calculated in Ubatuba embayments ranged from 0.06 to 1.9 cm·d-1. During the period of this investigation (from March/03 to May/2004), the highest 222Rn in excess inventories were observed late in the summer season (March). Taking into account all vertical profiles established, the relative variability was 67%. Although, if we consider only the fluxes determined in both Flamengo and Fortaleza embayments, the relative variation was 21%.
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OLIVEIRA, J.; COSTA, P.; BRAGA, E.S. Seasonal variations of 222Rn and SGD fluxes to Ubatuba embayments,
São Paulo. Journal of Radioanalytical and Nuclear Chemistry, v. 269, n. 3, p. p. 689-695, 2006. DOI: 10.1007/s10967-006-0287-2. Disponível em: http://repositorio.ipen.br/handle/123456789/5365. Acesso em: 30 Dec 2025.
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